BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, APRIL 29, 2016 
ALL TIMES ARE IN EASTERN STANDARD TIME

CLOUDY SKIES AND CHILLY TEMPERATURES, HUMIDITY INCREASING

Skies were mostly cloudy today, and temperatures were again
slightly below average.  The minimum recorded this morning was 
40F.  Temperatures reached 56F by the 1:00 PM EST observation,
giving the day an average temperature of 48F, 4F below normal.

Winds decreased in the afternoon to light and variable while
visibility increased to 60 miles in all directions.


Today's Observations:

7 A.M.
Weather: Scattered altocumulus, broken cirrus
Temperature: 45F; Dew Point: 35F; Wind: SE at 7 kts,
Sea-level pressure: 30.19 ins. Hg, rising, then more quickly
Visibility: 40 miles, except 30 miles WSW-WNW
6-hr Max temp: 45F 
6-hr Min temp: 40F
24-hr precip: 0.00 in.
BHO SA 1155 160 SCT E250 BKN 40 225/45/35/1307/019/ 
SBY WSW-WNW 30/ 8/082 53016 10045 20040     

10 A.M.
Weather: Scattered altocumulus, scattered cirrostratus
Temperature: 49F; Dew Point: 30F; Wind: estimated ESE at 5 kts,
Wind: Light and variable
Sea-level pressure: 30.20 ins. Hg, rising, then more quickly 
Visibility: 55 miles
BHO SA 1455 160 SCT 250 SCT 55 226/49/30/E1105/020/ 
WND LGT/ 8/089 53001
 
1 P.M.
Weather: Scattered altocumulus, scattered cirrostratus
Temperature: 56F; Dew Point: 32F; Wind: estimated E at 5 kts,
Sea-level Pressure: 30.15 ins. HG, falling, then more quickly 
Visibility: 60 miles   
6-hr Max temp: 56F 
6-hr Min temp: 45F  
BHO SA 1755 160 SCT 250 SCT 60 209/56/32/E0805/015/ 
WND L/V/ 8/089 58017 10056 20045

SUMMARY FOR THURSDAY, APRIL 28, 2016 
  
TEMPERATURE (DEGREES F)
MAX.....60   NORMAL.....61
MIN.....37   NORMAL.....42 
MEAN....49   NORMAL.....52

DEPARTURE FROM 30-YEAR NORMAL.........................-3
TOTAL DEPARTURE FOR THE MONTH........................-15 [-0.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............16   DEPARTURE..........+2
TOTAL HEATING UNITS FOR THE MONTH.............541   DEPARTURE.........+16
TOTAL HEATING UNITS FOR THE SEASON...........4960   DEPARTURE.......-1049
TOTAL HEATING UNITS LAST SEASON TO DATE......6244   DIFFERENCE......-1284   

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................26  S   AT   6:36 P.M.    
                   ASOS........................28  S   AT   6:27 P.M.      
                   DAVIS.......................26  S   AT   6:30 P.M.  RMY 27
FASTEST MILE FOR YESTERDAY.....................21  S   AT   6:25 P.M.         
MAXIMUM 2-MINUTE ASOS AVERAGE..................21  S   AT   6:38 P.M.   
MAXIMUM 2-MINUTE DAVIS AVERAGE.................19  S   AT   6:30 P.M.     
AVERAGE WIND SPEED AND DIRECTION...............9.3 NNW 
                   ASOS........................9.2
                   DAVIS.......................8.1 SSW [210 Deg.]
* last of several occurrences 

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.14
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........4.17  DEPARTURE......-0.11
                         ASOS..............4.36
TOTAL PRECIPITATION FOR THE YEAR..........16.75  DEPARTURE......-1.53
                         ASOS.............17.37

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)  
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE.......-0.1
TOTAL SNOWFALL FOR THE MONTH...............15.0  DEPARTURE......+12.0
TOTAL SNOWFALL FOR THE SEASON..............57.5  DEPARTURE.......-5.7

PRELIMINARY CLIMATE SUMMARY FOR APRIL CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/ AERO/RMY GUST
AERO: Aerovane wind recording system gust
RMY:  R.M. Young wind gust recording system
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized

4/1  66/54/60/+19/0.06/0.0/092/12          39 SSW AERO N/A    RMY 43
4/2  54/40/47/+6/0.47/0.0/023/03           23 SSW AERO N/A    RMY N/A        
4/3  40/23/32/-10/0.85/7.7/354/46          46 W   AERO N/A    RMY 55
4/4  28/21/25/-17/0.63/7.3/000/00          29 NNE AERO N/A    RMY 25
4/5  35/19/27/-16/0.00/0.0/660/85          25 NW  AERO N/A    RMY 27
4/6  41/21/31/-12/0.00/0.0/483/62          44 S   AERO N/A    RMY N/A   
4/7  56/41/49/+6/1.41/0.0/000/00           53 SSE AERO 59 SSE RMY 55
4/8  52/32/42/-2/T/0.0/353/45              41 WSW AERO 45 WSW RMY 42
4/9  47/29/38/-6/0.00/0.0/417/53           33 NW  AERO 39 NW  RMY 32
4/10 49/26/38/-7/0.00/0.0/735/93           30 NW  AERO 32 NW  RMY 31
4/11 58/40/49/+4/0.01/T/182/23             47 S   AERO 52 S   RMY N/A
4/12 59/37/48/+3/0.30/0.0/040/05           53 S   AERO 60 S   RMY 54 
4/13 53/33/43/-3/0.00/0.0/798/100          21 NNW AERO 25 NNW RMY 21
4/14 48/33/41/-5/0.00/0.0/793/99           28 ENE AERO 28 NNE RMY 26
4/15 54/35/45/-2/0.00/0.0/804/100          26 NNE AERO 28 NNE RMY N/A
4/16 52/39/46/-1/0.00/0.0/783/97           36 NNE AERO 31 NNE RMY 34
4/17 62/36/49/+2/0.00/0.0/809/100          20 NNE AERO 20 NNE RMY 19
4/18 67/45/56/+8/.../0.0/715/88            28 ENE AERO 29 NE  RMY 28
4/19 55/41/48/0/.../0.0/440/54             25 NW  AERO 30 NW  RMY N/A
4/20 57/41/49/0/0.00/0.0/801/98            29 NNW AERO 30 NNW RMY 29
4/21 76/38/57/+8/0.00/0.0/795/97           28 W   AERO 29 WSW RMY 28
4/22 80/56/68/+19/..../.../..              36 S   AERO 37 S   RMY 36
4/23 60/46/53/+3/..../.../.../..           26 NNW AERO 60 NNW RMY 24
4/24 59/38/49/-1/0.00/0.0/.../..           23 NW  AERO 25 NW  RMY 24
4/25 63/41/52/+2/0.00/0.0/.../..           23 W   AERO 24 W   RMY N/A
4/26 52/35/44/-7/0.36/0.0/.../..           33 E   AERO 35 E   RMY 31
4/27 61/33/47/-4/..../0.0/.../..           28 S   AERO 39 S   RMY 29 
4/27 60/37/49/-3/0.00/0.0/.../..           26 S   AERO 30 S   RMY 27

4/28 low temp since midnight is 40F; normal now 42F

DAILY RECORDS FOR APRIL 2016

4/1/16: NEW DAILY RECORD HIGH MINIMUM TEMPERATURE OF 54F,
BREAKS PREVIOUS RECORD OF 51F SET IN 1948

4/4/16: NEW DAILY RECORD SNOWFALL OF 7.3 INS, 
BREAKS PREVIOUS RECORD OF 3.7 INS SET IN 1975

4/4/16: NEW DAILY RECORD LOW MAXIMUM TEMPERATURE OF 28F,
BREAKS PREVIOUS RECORD OF 32F SET AND TIED IN 1896, 1908, 1975

4/22/16: NEW DAILY RECORD HIGH MINIMUM TEMPERATURE OF 56F, 
BREAKS PREVIOUS RECORD OF 55F IN 1977 AND 1992

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated): 

RECORDS FOR APRIL 29
HIGH 85 IN 1974
LOW 26 IN 1909
PRECIP 1.65 IN 1923
SNOWFALL 1.0 IN. IN 1987
PEAK GUST 55 MPH WNW IN 2010

RECORDS FOR APRIL 30
HIGH 86 IN 1942
LOW 30 IN 1931
PRECIP 1.41 IN 1991
SNOWFALL 0.3 IN. IN 1909
PEAK GUST 64e MPH NW IN 1978

TODAY'S REPORT PREPARED BY: Cecilia Borries-Strigle